Vulcanizing apparatus



Sept. 27, 1932. Q, GRANGE 1,879,194

VULCANI Z I NG APPARATUS Filed Oct. 29. 1929 IIII all a4 4 ,qd @127 a?fwz/c nfar [60 d G'raw e Patented Sept. 27, 1932 UNITED vfsl'n xrizs LEOo. GRANG or omoAGo,

PATENT;-,oFFIcEQ;

rumors, assrenon wwrmm .ikJAnnArnori CHICAGO, ILLINOIS, I V

vUnoAmz'mG Arminirrtrs Application med ctober 29,' 192 9. Serial in.403,243. r 15 V My invention relates to a 'retreader for'automobileotires or casings and has, for one object to provide improvedheating means .for such a retreader. Another object is the provision ofa-retreader'which shall be simple,'easyand eflicient in use. Anotherpurpose is the provision of improved heatinsulating' means 'for,controlling -the heat ap-v pliedto such a retreader. Another'object isthe provision of improved means'for heating such afretreader byelectricity, without the employment of a fluid heating medium. Otherobjects will appear from time to time in the course of the specificationand claims.

Like parts are indicated by like symbols throughout the specificationand drawing.

Referring to the drawing, A indicates any suitable supporting members,with which is associated, or upon which ,is supported a main framemember generally indicated as A which includes a lower horizontal memberA? with an inner" portion A projecting in-K wardly' within thesupporting members A t and an outer'portion Aprojecting external- 1y ofthesupports A. A is a generally cyand overlying-the corresponding lowermember A A plurality of bosses A7 are provided about the rim A", thesebosses being aligned above-the rim or ring A.

ecured aboutthe exteriorsurface of the Qthe resistance elementsandad'aptedto make member A are annular heating elements.

' Each such heating element includes an inposed tothe exterior surfaceof the member A. B proper, which may be formed of any suitable wire ormetallic member which becomes heated upon the passage of current therethrough. B 'isa relativelythin layer ofa indicates the resistance.element.

are quite flexible. The compo site rrlg l a S formed may be held inposition, as by the ring 13* the ends of which may be upset as: atB

to receive .the'securing screw or boltB with its nut B Bythe employmentof this or. equivalent securing and tightening means the ring'or band Bmay be drawn up about the heating element, to holdit in intimate contactwith the opposed face of the member. A5.

As shown in Figure 21 illustrate-an upper and alower heating elementseparated by a space B5, the purpose of which spacingwill laterappear. ao, f

The space between the flanges or rings A and A? may be filled with anysuitable insulating material C, which may beasbestosor mineral woolorany-otherinsulating means.

inward projections C? and secured to :them as bythescrews G --Each suchangular segment i s-- provided:"with the flange -G., the

flan es extendingtow'ard each othervas' shown 111 1gurev2. Securedtothese; flanges". may ,be any' suitable arcuate sheetmembers C securedtothe por-tion C as by the'screws C".

= C indicates any suitable insulating means,

such as sheet asbestos, whereby-the members O are insulated from theheated flangesA lindrical rim or'ring-a'nd Aiisa horizontal A upper rimor flange conforming generally to radiat s,an smutamas -mag ameansinterposed in. the actuating circuit of and break the actuating circuitin'response to .change in temperature ofthe member A; ner heat resistinginsulating member B 0p the flange A and which conforms also to the innerface of th e member A A correspond-.-

In order to confine-this insulating material 1 ing upper matrix Ecompletes the matrix impression for the tire. In-practice' the casingmay be laid uponthe matrix E. The heat'resisting' insulation such asasbestos or the like. These thin heating element bands matrix B. is,then superposed and may be stance for example the clamps E which may betightened as by the bolts E to draw them downwardly against the bossesor base A These clamps hold the upper matrix'member spirit of myinvention. I thereforewish my description and drawing to be taken as ina broad sense illustrative and diagrammatic rather than as limiting meto my specific showing. v As to the actual heat responsive meansemployed I may for exampleemploy a Bourdon tube and the drawing containsa diagrammatic showing of-such a tube. The use and operation of myinvention'are as follows: a Y r In retreading tires the rubberto betreated is positioned chiefly on the bottom of the tire and extends upabout the sides of the tire only a limited distance, itbeingthe treadportion proper which is primarilyaffected. In the retreader hereindescribed and claimed I have provided a particularly efficient andeconomical andsafe device for applying heat to the tread. The member A,'in the form of a ring or short cylinder,extends entirely about thetread of the tire. The matrix or matrices which actually engage the"tire are formed to maintain a' close engagement with the inner face ofthe member A These matrix members 7E and E may be made for example ofaluminum, and readily transmit the heat from the member A to the treadof the tire; To the outer face of the member A I secure the resistanceelements in close conf tact. I have illustrated twoSQPtLI'flteIGSlStanceelements, separated along the central portion ofthe member A. This separation'is for the purpose of' c'oping with thetendency of therather heavy casting to build up heat in the center ifheat is applied evenly throughout its entire-outer surface. If averythin or band,'the intermediate area tends to get hotter than the edges,if the heat is evenly applied to the exterior, causing an unevenapplication of the heat to the work. By splitting the resistance elementand by providing the 1 cylindrlcal member having an nwardly extendingflange at the base thereofto recelve break B between the elements, inline with the central portion of the casting where the heat building uptendency exists, I get a very. "even distribution of effective heat'atthe inner face of the casting. Or rather, I get such distribution as isnecessary to cause the ma trix members EE todeliv'eran even heat tocular-rcsistance elements very firmly against the exterior of the memberA This intimate contact is an important'feature in connection but willbe built up'in theresistance element itself. This will reducethelife ofthe resistance element by breaking down its insulation. and by oxidizingthe resistance wireitself, This is avoided by maintaining the intimate'contact with the member-A above referred to. f"

While I do not wish to be limited to' any particular resistance heatingelement,Ifin'd it useful'and practicalto employ a heating 'elementinwhich generally flat resistance wires are compressed between plates ofthin insulating material, such asmica. I claim: V I i 1'. In avulcanizing device, an annular frame member having a generallycylindrical outer face, a work engaging matrix opposed to and in closeengagement with the inner face of saidframe" member, and electricalresistance heatingmeans opposed'to and conforming'to the exteriorcylindrical face of said frame member, said heating meanscomprising-theemployment of a pair of annular resistance elements 1extending CllCllDl-felentially about the exterior cylindric'al face of.the frame-'memberand spaced laterally apart.

thereupon along the axis of said cylinderto prevent 'exces's of heatatthe central portion of the matrix.

A tire vulcanizer including a cylindr-i-1 cal member forembraclng'atlre', and means "for heating said member'mcluding a flexible heatingelement arranged about the periphery of said cylindrical memberand atensioning band about said element for drawing the element intointimatecontact'with the outer periphery of said cylindrical member. 3.A tire-retreader comprls ngan-annular =ported on said flange, clampsmounted on the top of said cylinder forc'lamping said tread mold memberson said flange,'said cylindrical member being rovided with outerperipheral flanges at the ase and top thereof, an electrical heatingelement about said cylindrical" member between said outer peripheralflanges, V

insulating material aboutsaid heating element between said outerperipheral flanges, a-

casing about said insulatingvmaterial, said casing being secured to thelast-named flanges,

and means between the casing and the flanges for insulatingthe formerfrom the latter.

Signed at Chicago, count of Cook andi State of Illinois, this 25th ay ofOctober, 1929.

LEO o. GRANGE,

